include/linux/gpio.h

   1 #ifndef __LINUX_GPIO_H
   2 #define __LINUX_GPIO_H
   3
   4 /* see Documentation/gpio.txt */
   5
   6 #ifdef CONFIG_GENERIC_GPIO
   7 #include <asm/gpio.h>
   8
   9 #else
  10
  11 #include <linux/kernel.h>
  12 #include <linux/types.h>
  13 #include <linux/errno.h>
  14
  15 struct device;
  16 struct gpio;
  17 struct gpio_chip;
  18
  19 /*
  20  * Some platforms don't support the GPIO programming interface.
  21  *
  22  * In case some driver uses it anyway (it should normally have
  23  * depended on GENERIC_GPIO), these routines help the compiler
  24  * optimize out much GPIO-related code ... or trigger a runtime
  25  * warning when something is wrongly called.
  26  */
  27
  28 static inline bool gpio_is_valid(int number)
  29 {
  30         return false;
  31 }
  32
  33 static inline int gpio_request(unsigned gpio, const char *label)
  34 {
  35         return -ENOSYS;
  36 }
  37
  38 static inline int gpio_request_one(unsigned gpio,
  39                                         unsigned long flags, const char *label)
  40 {
  41         return -ENOSYS;
  42 }
  43
  44 static inline int gpio_request_array(const struct gpio *array, size_t num)
  45 {
  46         return -ENOSYS;
  47 }
  48
  49 static inline void gpio_free(unsigned gpio)
  50 {
  51         might_sleep();
  52
  53         /* GPIO can never have been requested */
  54         WARN_ON(1);
  55 }
  56
  57 static inline void gpio_free_array(const struct gpio *array, size_t num)
  58 {
  59         might_sleep();
  60
  61         /* GPIO can never have been requested */
  62         WARN_ON(1);
  63 }
  64
  65 static inline int gpio_direction_input(unsigned gpio)
  66 {
  67         return -ENOSYS;
  68 }
  69
  70 static inline int gpio_direction_output(unsigned gpio, int value)
  71 {
  72         return -ENOSYS;
  73 }
  74
  75 static inline int gpio_set_debounce(unsigned gpio, unsigned debounce)
  76 {
  77         return -ENOSYS;
  78 }
  79
  80 static inline int gpio_get_value(unsigned gpio)
  81 {
  82         /* GPIO can never have been requested or set as {in,out}put */
  83         WARN_ON(1);
  84         return 0;
  85 }
  86
  87 static inline void gpio_set_value(unsigned gpio, int value)
  88 {
  89         /* GPIO can never have been requested or set as output */
  90         WARN_ON(1);
  91 }
  92
  93 static inline int gpio_cansleep(unsigned gpio)
  94 {
  95         /* GPIO can never have been requested or set as {in,out}put */
  96         WARN_ON(1);
  97         return 0;
  98 }
  99
 100 static inline int gpio_get_value_cansleep(unsigned gpio)
 101 {
 102         /* GPIO can never have been requested or set as {in,out}put */
 103         WARN_ON(1);
 104         return 0;
 105 }
 106
 107 static inline void gpio_set_value_cansleep(unsigned gpio, int value)
 108 {
 109         /* GPIO can never have been requested or set as output */
 110         WARN_ON(1);
 111 }
 112
 113 static inline int gpio_export(unsigned gpio, bool direction_may_change)
 114 {
 115         /* GPIO can never have been requested or set as {in,out}put */
 116         WARN_ON(1);
 117         return -EINVAL;
 118 }
 119
 120 static inline int gpio_export_link(struct device *dev, const char *name,
 121                                 unsigned gpio)
 122 {
 123         /* GPIO can never have been exported */
 124         WARN_ON(1);
 125         return -EINVAL;
 126 }
 127
 128 static inline int gpio_sysfs_set_active_low(unsigned gpio, int value)
 129 {
 130         /* GPIO can never have been requested */
 131         WARN_ON(1);
 132         return -EINVAL;
 133 }
 134
 135 static inline void gpio_unexport(unsigned gpio)
 136 {
 137         /* GPIO can never have been exported */
 138         WARN_ON(1);
 139 }
 140
 141 static inline int gpio_to_irq(unsigned gpio)
 142 {
 143         /* GPIO can never have been requested or set as input */
 144         WARN_ON(1);
 145         return -EINVAL;
 146 }
 147
 148 static inline int irq_to_gpio(unsigned irq)
 149 {
 150         /* irq can never have been returned from gpio_to_irq() */
 151         WARN_ON(1);
 152         return -EINVAL;
 153 }
 154
 155 #endif
 156
 157 #endif /* __LINUX_GPIO_H */